Reserve power indicating system in a timepiece



Dec. 14, 1965 G. RAVAL 3,222,860

RESERVE POWER NDGANG SYSEM IN A ''MEPEcE F11ed June 15' 1964 INVENTOR ATTORNEY an1plitude, a mark on said balance wheel and a vvil1dov' al0wing observati011 0f a poftion of the balance wheel, Said Window and mark having an angular extension small aS compared With the said limit amplitude and I10minal amp]itude, Said mark being in Said Window when the balance wheel is in the Teversal p0int of itS 0Sci1lati0n at said limit an1plitude 3. A Teserve powe1 indicating system according to claim z, Wherein Said limit amplitude iS 180 and the mark of the balance wheel and the Window are 10cated in lace8 diametrany opposite with Teference t0 the aXis of the balance Wheel vvhen the balance Wheel is in itS neutral p0sition( 4. A reserve power indicating System in a timepiece having a balance vvheel, particularly in an electric or eec tronic tinlepiece, Said balance Wheel having a 10Wer limit amplitude at Which proper opefation of the Hmepiece iS Still Warranted and a nominal amplitude exceeding Said limit amplitude, a visible mark on said balance Wheel swinging through a predetermined angular ortion of a circular ath at said limit am litude, Window means for observation of a portion of Said balance Whel including said angular path 0f the mark, said mark appearing in Said window when the balance wheel is in the Teversal oint of its oscillation at said limit amplitude, but the mark does no longer appear in the Window for amp1itudes below Said limit amplitude 5 A Teserve 0Wer indicating System in a tin1epiece having a balance Wheel, particularly in an electric O1' elec tronic timepiece, Said balance Wheel having a 10Wer 1imit amplitude at Which proper operation of the tin1epiece is Still Warranted and a I10minal afnplitude exceeding Said lilT1it amplitude, Wind0vv means for observation of Said balance Wheel, a Teference on said balance wheel and a reference on a stationary portion of the time iece, Said refefences Visibly coinciding vvhen the balance Whee iS in the reversal point of its 0Scillation at lin1it amplitude.

1 46l 67l 7/1923 Page l16lz4 FOREIGN PATENTS 99 3S2 11/19Sl France.

36,829 7/l906 switzerland 360,34S 3/ 1962 switzer1and( OTHER REFERENCES Hope-]0nes, F Electric C10cks, 1IAG Press Ltd., London, 1931 Ts 544 II 6 Chapter "Battery vvarning 

1. A RESERVE POWER INDICATING SYSTEM IN A TIMEPIECE HAVING A BALANCE WHEEL, PARTICULARLY IN AN ELECTRIC OR ELECTRONIC TIMPIECE, SAID BALANCE WHEEL HAVING A LOWER LIMIT AMPLITUDE AT WHICH PROPER OPERATION OF THE TIMEPIECE IS WARRANTED AND A NOMINAL AMPLITUDE EXCEEDING SAID LIMIT AMPLITUDE, A MARK ON SAID BALANCE WHEEL AND AT LEAST ONE REFERENCE MARK ON A STATIONARY PORTION OF THE TIMEPIECE, WINDOW MEANS ALLOWING OBSERVATION OF SAID BALANCE WHEEL, SAID MARK AND REFERENCE MARK HAVING A SIZE IN CIRCUMFERENTIAL DIRECTION OF THE BALANCE WHEEL WHICH IS SMALL COMPARED WITH SAID LIMIT AMPLITUDE AND NOMINAL AMPLIPARED WITH THE SAID LIMIT AMPLITUDE AND NOMINAL AMPLITUDE OF THE BALANCE WHEEL, SAID MARK AND REFERENCE MARK OF ITS OSCILLATION AT SAID LIMIT AMPLITUDE. 